i was trying to find out if the peavey mark 4 a rack mountable head? or if the marshall 3540 is rack mountable, i have done searches on these amps but am unable to find a pic or anything that says if its rack mountable? my freind has an old peavey head i can't remeber the model i think its a mark ?? but its not rak mountable it way to wide, adn it is sorta allready in it own casing.